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Editorial Team
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Asked: 2026-06-14T14:53:43+00:00

In the makefile: CUSTOM_CFLAGS=-Wall -ggdb3 -O3 -std=gnu99 -frename-registers -pthread -Wsign-compare -D_GNU_SOURCE SYS_CFLAGS=-DNO_THREAD_LOCAL LDFLAGS=-pthread -rdynamic

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In the makefile:

 CUSTOM_CFLAGS=-Wall -ggdb3 -O3 -std=gnu99 -frename-registers -pthread -Wsign-compare -D_GNU_SOURCE

 SYS_CFLAGS=-DNO_THREAD_LOCAL
 LDFLAGS=-pthread -rdynamic
 LIBS=-lm -ldl

Where should I put the above in Xcode project?

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1 Answer

  1. Editorial Team

    Makefile flags correspond to Xcode build settings. Look into the following build settings:

    Optimization Level for the -O3 flag.
    C Language Dialect for the -std=gnu99 flag.
    Other C Flags for the other flags in the CUSTOM_CFLAGS and SYS_CFLAGS flags.
    Other Linker Flags for the LDFLAGS and LIBS flags.

    Xcode may have build settings for some of the flags in the makefile’s CUSTOM_CFLAGS flag list and the linker flags. I haven’t memorized the build settings list. If you open the Quick Help inspector, you can read a description of each build setting by selecting the build setting from the build settings list. Choose View > Utilities > Show Quick Help Inspector to show the Quick Help inspector.

    If you don’t know where to find Xcode’s build settings, read the following article:

    Xcode 4: Accessing Build Settings

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