Invalid escape sequence in macro

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Invalid escape sequence in macro

FRamold
Hi,

today i ran into an error with escape characters in macros. Is this a known issue? Is this by design? How can I workaround?

Code:
function(f STRING)
   message(STATUS ${STRING})
endfunction()

macro(m STRING)
   message(STATUS ${STRING})
endmacro()

set(CONTENT "bla bla \/\/")
message(STATUS ${CONTENT})
f(${CONTENT})
m(${CONTENT})

Output:
ramold@xxx MINGW64 /c/Program Files/CMake/cmake-3.13.4-win64-x64/bin
$ ./cmake.exe -P test.cmake
CMake Warning (dev) at test.cmake:9 (set):
  Syntax error in cmake code at

    C:/Program Files/CMake/cmake-3.13.4-win64-x64/bin/test.cmake:9

  when parsing string

    bla bla \/\/

  Invalid escape sequence \/

  Policy CMP0010 is not set: Bad variable reference syntax is an error.  Run
  "cmake --help-policy CMP0010" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
This warning is for project developers.  Use -Wno-dev to suppress it.

-- bla bla \/\/
-- bla bla \/\/
CMake Warning (dev) at test.cmake:6 (message):
  Syntax error in cmake code at

    C:/Program Files/CMake/cmake-3.13.4-win64-x64/bin/test.cmake:6

  when parsing string

    bla bla \/\/

  Invalid escape sequence \/

  Policy CMP0010 is not set: Bad variable reference syntax is an error.  Run
  "cmake --help-policy CMP0010" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
Call Stack (most recent call first):
  test.cmake:12 (m)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- bla bla \/\/

Regards,
Felix Ramold
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Re: Invalid escape sequence in macro

Stephan.Szabo
I would expect that you're running into a consequence of:
"In a function, ARGN, ARGC, ARGV and ARGV0, ARGV1, ... are true variables in the usual CMake sense. In a macro, they are not, they are string replacements much like the C preprocessor would do with a macro."

So I would expect the backslash escapes are done first on the set line, and then the value of the variable after the escaping are replaced into the message line in the macro which will then try to handle escapes again.

It seems like a function may be better for this sort of thing, but what does the actual use case look like?

Regards,
Steph

-----Original Message-----
From: CMake <[hidden email]> On Behalf Of Ramold, Felix
Sent: Monday, March 11, 2019 8:20 AM
To: [hidden email]
Subject: [CMake] Invalid escape sequence in macro

Hi,

today i ran into an error with escape characters in macros. Is this a known issue? Is this by design? How can I workaround?

Code:
function(f STRING)
   message(STATUS ${STRING})
endfunction()

macro(m STRING)
   message(STATUS ${STRING})
endmacro()

set(CONTENT "bla bla \/\/")
message(STATUS ${CONTENT})
f(${CONTENT})
m(${CONTENT})

Output:
ramold@xxx MINGW64 /c/Program Files/CMake/cmake-3.13.4-win64-x64/bin
$ ./cmake.exe -P test.cmake
CMake Warning (dev) at test.cmake:9 (set):
  Syntax error in cmake code at

    C:/Program Files/CMake/cmake-3.13.4-win64-x64/bin/test.cmake:9

  when parsing string

    bla bla \/\/

  Invalid escape sequence \/

  Policy CMP0010 is not set: Bad variable reference syntax is an error.  Run
  "cmake --help-policy CMP0010" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
This warning is for project developers.  Use -Wno-dev to suppress it.

-- bla bla \/\/
-- bla bla \/\/
CMake Warning (dev) at test.cmake:6 (message):
  Syntax error in cmake code at

    C:/Program Files/CMake/cmake-3.13.4-win64-x64/bin/test.cmake:6

  when parsing string

    bla bla \/\/

  Invalid escape sequence \/

  Policy CMP0010 is not set: Bad variable reference syntax is an error.  Run
  "cmake --help-policy CMP0010" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
Call Stack (most recent call first):
  test.cmake:12 (m)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- bla bla \/\/

Regards,
Felix Ramold
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Kitware offers various services to support the CMake community. For more information on each offering, please visit:

CMake Support: http://cmake.org/cmake/help/support.html
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Re: Invalid escape sequence in macro

FRamold
Thank you, Steph

This might be related. I think the macro somehow resolves the escapes before executing the marco commands.

Today I found out, this error is much worse in a project (instead of a script).

Please see the updated code (now we escape correctly at declaration):
function(f STRING)
   message(STATUS "In function: ${STRING}")
endfunction()

macro(m STRING)
   message(STATUS "In macro: ${STRING}")
endmacro()

set(CONTENT "bla bla \\/\\/")
message(STATUS "No call1: ${CONTENT}")
f(${CONTENT})
m(${CONTENT})
message(STATUS "No call2: ${CONTENT}")

Output:
C:\Program Files\CMake\cmake-3.13.4-win64-x64\bin>cmake -P test.cmake
-- No call1: bla bla \/\/
-- In function: bla bla \/\/
CMake Warning (dev) at test.cmake:6 (message):
  Syntax error in cmake code at

    C:/Program Files/CMake/cmake-3.13.4-win64-x64/bin/test.cmake:6

  when parsing string

    In macro: bla bla \/\/

  Invalid escape sequence \/

  Policy CMP0010 is not set: Bad variable reference syntax is an error.  Run
  "cmake --help-policy CMP0010" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
Call Stack (most recent call first):
  test.cmake:12 (m)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- In macro: bla bla \/\/
-- No call2: bla bla \/\/

Tthis gets way worse when it is a project:
project(testEscape)
cmake_minimum_required(VERSION 3.10)
...

The error is not reported. Silently the string is modified and printed wrongly!
C:\Program Files\CMake>cmake-3.13.4-win64-x64\bin\cmake.exe . -Bbuild313
-- Building for: Visual Studio 14 2015
-- The C compiler identification is MSVC 19.0.23918.0
-- The CXX compiler identification is MSVC 19.0.23918.0
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/cl.exe
-- Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/cl.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/cl.exe
-- Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/cl.exe -- works
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- No call1: bla bla \/\/
-- In function: bla bla \/\/
-- In macro: bla bla //
-- No call2: bla bla \/\/
-- Configuring done
-- Generating done
-- Build files have been written to: C:/Program Files/CMake/build313

Note that previous policies stopped configuration. Change
cmake_minimum_required(VERSION 3.0)

And you get:
...
-- No call1: bla bla \&
-- In function: bla bla \&
CMake Error at CMakeLists.txt:9 (message):
  Syntax error in cmake code at

    C:/Program Files/CMake/CMakeLists.txt:9

  when parsing string

    In macro: bla bla \&

  Invalid escape sequence \&
Call Stack (most recent call first):
  CMakeLists.txt:15 (m)


-- Configuring incomplete, errors occurred!


Regards,
Felix

-----Ursprüngliche Nachricht-----
Von: [hidden email] [mailto:[hidden email]]
Gesendet: Montag, 11. März 2019 17:28
An: Ramold, Felix; [hidden email]
Betreff: RE: Invalid escape sequence in macro

I would expect that you're running into a consequence of:
"In a function, ARGN, ARGC, ARGV and ARGV0, ARGV1, ... are true variables in the usual CMake sense. In a macro, they are not, they are string replacements much like the C preprocessor would do with a macro."

So I would expect the backslash escapes are done first on the set line, and then the value of the variable after the escaping are replaced into the message line in the macro which will then try to handle escapes again.

It seems like a function may be better for this sort of thing, but what does the actual use case look like?

Regards,
Steph

-----Original Message-----
From: CMake <[hidden email]> On Behalf Of Ramold, Felix
Sent: Monday, March 11, 2019 8:20 AM
To: [hidden email]
Subject: [CMake] Invalid escape sequence in macro

Hi,

today i ran into an error with escape characters in macros. Is this a known issue? Is this by design? How can I workaround?

Code:
function(f STRING)
   message(STATUS ${STRING})
endfunction()

macro(m STRING)
   message(STATUS ${STRING})
endmacro()

set(CONTENT "bla bla \/\/")
message(STATUS ${CONTENT})
f(${CONTENT})
m(${CONTENT})

Output:
ramold@xxx MINGW64 /c/Program Files/CMake/cmake-3.13.4-win64-x64/bin
$ ./cmake.exe -P test.cmake
CMake Warning (dev) at test.cmake:9 (set):
  Syntax error in cmake code at

    C:/Program Files/CMake/cmake-3.13.4-win64-x64/bin/test.cmake:9

  when parsing string

    bla bla \/\/

  Invalid escape sequence \/

  Policy CMP0010 is not set: Bad variable reference syntax is an error.  Run
  "cmake --help-policy CMP0010" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
This warning is for project developers.  Use -Wno-dev to suppress it.

-- bla bla \/\/
-- bla bla \/\/
CMake Warning (dev) at test.cmake:6 (message):
  Syntax error in cmake code at

    C:/Program Files/CMake/cmake-3.13.4-win64-x64/bin/test.cmake:6

  when parsing string

    bla bla \/\/

  Invalid escape sequence \/

  Policy CMP0010 is not set: Bad variable reference syntax is an error.  Run
  "cmake --help-policy CMP0010" for policy details.  Use the cmake_policy
  command to set the policy and suppress this warning.
Call Stack (most recent call first):
  test.cmake:12 (m)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- bla bla \/\/

Regards,
Felix Ramold
--

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Please keep messages on-topic and check the CMake FAQ at: http://www.cmake.org/Wiki/CMake_FAQ

Kitware offers various services to support the CMake community. For more information on each offering, please visit:

CMake Support: http://cmake.org/cmake/help/support.html
CMake Consulting: http://cmake.org/cmake/help/consulting.html
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