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configure: Properly check for availability of -Wno-foo warning flags

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For some weird reason gcc does not check if the -Wno disabling variants
of warning flags match existing warning flags. Instead it swallows them
silently. That is, unless other warning or error messages are generated,
because then - for some even more bizarre reason - a complaint about the
unknown disable warning flag is issued along with the error or warning
message.

Thus to check for the availability of a warning disabling option, one
needs to check for the enabling variant instead and then add the
disabling variant to CFLAGS.
This commit is contained in:
Diego Biurrun 2013-10-31 20:14:37 +01:00
parent 23157d72b5
commit 056fd4fe65
1 changed files with 11 additions and 5 deletions

16
configure vendored

@ -3903,13 +3903,9 @@ enabled debug && add_cflags -g"$debuglevel" && add_asflags -g"$debuglevel"
# add some useful compiler flags if supported # add some useful compiler flags if supported
check_cflags -Wdeclaration-after-statement check_cflags -Wdeclaration-after-statement
check_cflags -Wall check_cflags -Wall
check_cflags -Wno-parentheses
check_cflags -Wno-switch
check_cflags -Wno-format-zero-length
check_cflags -Wdisabled-optimization check_cflags -Wdisabled-optimization
check_cflags -Wpointer-arith check_cflags -Wpointer-arith
check_cflags -Wredundant-decls check_cflags -Wredundant-decls
check_cflags -Wno-pointer-sign
check_cflags -Wcast-qual check_cflags -Wcast-qual
check_cflags -Wwrite-strings check_cflags -Wwrite-strings
check_cflags -Wtype-limits check_cflags -Wtype-limits
@ -3918,6 +3914,17 @@ check_cflags -Wmissing-prototypes
check_cflags -Wstrict-prototypes check_cflags -Wstrict-prototypes
enabled extra_warnings && check_cflags -Winline enabled extra_warnings && check_cflags -Winline
check_disable_warning(){
warning_flag=-W${1#-Wno-}
test_cflags $warning_flag && add_cflags $1
}
check_disable_warning -Wno-parentheses
check_disable_warning -Wno-switch
check_disable_warning -Wno-format-zero-length
check_disable_warning -Wno-pointer-sign
enabled extra_warnings || check_disable_warning -Wno-maybe-uninitialized
# add some linker flags # add some linker flags
check_ldflags -Wl,--warn-common check_ldflags -Wl,--warn-common
check_ldflags -Wl,-rpath-link=libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample check_ldflags -Wl,-rpath-link=libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil:libavresample
@ -4008,7 +4015,6 @@ elif enabled gcc; then
check_cflags -Werror=return-type check_cflags -Werror=return-type
check_cflags -Werror=declaration-after-statement check_cflags -Werror=declaration-after-statement
check_cflags -Werror=vla check_cflags -Werror=vla
enabled extra_warnings || check_cflags -Wno-maybe-uninitialized
elif enabled llvm_gcc; then elif enabled llvm_gcc; then
check_cflags -mllvm -stack-alignment=16 check_cflags -mllvm -stack-alignment=16
elif enabled clang; then elif enabled clang; then