Use standard macros

makefile

CC = c99
CFLAGS = -O2
LDFLAGS =
LDLIBS =

app: main.o util.o
	$(CC) $(LDFLAGS) -o $@ main.o util.o $(LDLIBS)

Explanation

Keeping `CC`, `CFLAGS`, `LDFLAGS`, and `LDLIBS` overridable is a long-standing portable convention.

Learn the surrounding workflow

Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Same sheet · prioritizing Portable make basics

Write simple, explicit file rules compatible with standard make.

Open In sheetmakefilesame section

Provide common non-file maintenance targets.

Open In sheetmakefilesame section

Allow users to customize toolchain choices.

Open In sheetbashsame section

Use classic suffix rules when targeting very portable make implementations.

Open In sheetmakefilesame section

Stop on failure explicitly within one recipe line.

Open In sheetmakefile1 tag match

Prefer explicit rules over GNU metaprogramming.

Open In sheetmakefile1 tag match