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-rw-r--r--tasks/toolchains/gcc.rake2
1 files changed, 1 insertions, 1 deletions
diff --git a/tasks/toolchains/gcc.rake b/tasks/toolchains/gcc.rake
index 66fa75dcb..9b0b39d5c 100644
--- a/tasks/toolchains/gcc.rake
+++ b/tasks/toolchains/gcc.rake
@@ -1,7 +1,7 @@
MRuby::Toolchain.new(:gcc) do |conf|
[conf.cc, conf.cxx, conf.objc, conf.asm].each do |cc|
cc.command = ENV['CC'] || 'gcc'
- cc.flags = [ENV['CFLAGS'] || %w(-g -O3 -Wall -Werror-implicit-function-declaration)]
+ cc.flags = [ENV['CFLAGS'] || %w(-g -std=gnu99 -O3 -Wall -Werror-implicit-function-declaration)]
cc.include_paths = ["#{MRUBY_ROOT}/include"]
cc.defines = %w(DISABLE_GEMS)
cc.option_include_path = '-I%s'