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SET(ENV{PKG_CONFIG_SYSROOT_DIR} $FOO) doesn't work on the first run

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SET(ENV{PKG_CONFIG_SYSROOT_DIR} $FOO) doesn't work on the first run

Antoine Villeret
Hello everyone, 

in my toolchain file I have :

    SET(ENV{PKG_CONFIG_SYSROOT_DIR} "${RPI_ROOT_PATH}")

then I run : 

cmake -DCMAKE_TOOLCHAIN_FILE=${PWD}/../of/dev/arm-linux-gnueabihf.cmake -DRPI_ROOT_PATH='/tmp/rpi/root' -DOF_PLATFORM=armv7 -G Ninja ../of

Environnement variable PKG_CONFIG_SYSROOT_DIR should then be filled with '/tmp/rpi/root'

But that doesn't work.

If I run `cmake` once again (with all of the arguments above), the environnement variable is correctly set.
I mean :

message(STATUS "PKG_CONFIG_SYSROOT_DIR: " $ENV{PKG_CONFIG_SYSROOT_DIR})

shows :

PKG_CONFIG_SYSROOT_DIR: /tmp/rpi/root

which is correct, but since `pkg-config` has been run without that defined on the first run, the include and library paths are not updated and build failed.

Why SET method doesn't set the variable right on the first run ?

If I use :

    SET(ENV{PKG_CONFIG_SYSROOT_DIR} "/tmp/rpi/root")

everything works fine.

Moreover a very minimal CMakeLists.txt and toolchain.cmake works fine (see : https://gist.github.com/avilleret/58ca1c9ba79cd203e16729ffe760ddc2).

The original files are here : 
and 

And I'm using CMake 3.5.2.

Where is my mistake ?

Regards

Antoine

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