MantisBT - CMake

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Date Submitted

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0004772

CMake

public

2007-04-03 11:39

2008-10-01 13:25

Reporter

irwin

Assigned To

Bill Hoffman

Priority

normal

Severity

major

Reproducibility

always

Status

closed

Resolution

fixed

Platform

OS Version

Product Version

Target Version

Fixed in Version

Summary

0004772: CMAKE_BUILD_TYPE does not work correctly for language enabled with ENABLE_LANGUAGE

Description

The combination

PROJECT(free_eos CXX)
ENABLE_LANGUAGE(C)

defines the correct CXX flags, but blanks the C flags in the cache rather than defining them properly, e.g.,

//C compiler.
CMAKE_C_COMPILER:FILEPATH=/usr/bin/gcc

//Flags for C compiler.
CMAKE_C_FLAGS:STRING=' '

//Flags used by the compiler during debug builds.
CMAKE_C_FLAGS_DEBUG:STRING=

//Flags used by the compiler during release minsize builds.
CMAKE_C_FLAGS_MINSIZEREL:STRING=

//Flags used by the compiler during release builds (/MD /Ob1 /Oi
// /Ot /Oy /Gs will produce slightly less optimized but smaller
// files).
CMAKE_C_FLAGS_RELEASE:STRING=

//Flags used by the compiler during Release with Debug Info builds.
//
CMAKE_C_FLAGS_RELWITHDEBINFO:STRING=

With these compile flags blanked, it turns, e.g., CMAKE_BUILD_TYPE=Debug into a no-op for the C language.

If I try, instead

PROJECT(free_eos C)
ENABLE_LANGUAGE(CXX)

then the C flags are defined correctly, but the CXX flags are blanked turning, e.g., CMAKE_BUILD_TYPE=Debug into a no-op for the C++ language.

I don't know a fix for this bug in ENABLE_LANGUAGE for Linux, and the only workaround is never to use it, and always specify required languages with the PROJECT command (which is awkward if you want to have language support at the user's option).

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